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7.2 definite integral — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMaths7.2 definite integral1 Mark
MCQ
$\int_0^{\pi /2} {\frac{{d\theta }}{{1 + \tan \theta }}} = $
  • A
    $\pi $
  • B
    $\frac{\pi }{2}$
  • C
    $\frac{\pi }{3}$
  • ✓
    $\frac{\pi }{4}$
✓

Answer

Correct option: D.
$\frac{\pi }{4}$
d
(d) $I = \int_0^{\pi /2} {\frac{{d\theta }}{{1 + \tan \theta }} = \int_0^{\pi /2} {\frac{{d\theta }}{{1 + \tan \left( {\frac{\pi }{2} - \theta } \right)}}} } $

$ = \int_0^{\pi /2} {\frac{{d\theta }}{{1 + \cot \theta }}} $

On adding, $2I = \int_0^{\pi /2} {\left( {\frac{1}{{1 + \tan \theta }} + \frac{1}{{1 + \cot \theta }}} \right)\,d\theta } $

$= \int_0^{\pi /2} {d\theta = [\theta ]_0^{\pi /2} = \frac{\pi }{2} \Rightarrow I = \frac{\pi }{4}} $.

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